Ning uses your personal information primarily to personalize the ads that appear on your computer screen while you are on the Ning Website.

"We use passively-collected information to administer, operate, and improve the Ning Platform and our other services and systems, and to provide services and content that are tailored to you, this includes providing customized advertisements and monitoring and reporting of the effectiveness of marketing campaigns. If we directly combine any information gathered through passive means with Personal Information, we treat the combined information as Personal Information under this Privacy Policy."
they do this so that way they can increase the chances of them making money from advertisers